Methanol filling gun
The methanol filling gun with anti-corrosion materials and innovative valve structure design solves the problems of slow filling speed and short service life, and achieves a fast filling and environmentally friendly filling process.
Patent Information
- Application Number
- CN202422134086.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-30
AI Technical Summary
Existing filler guns are slow when filling methanol gasoline, and due to the corrosiveness of methanol, the filler gun has a short service life.
A methanol filling gun is designed, with the inner wall and valve core made of anti-corrosion materials, combined with a pressure-free self-sealing valve, a control valve and a dual main valve core structure to achieve rapid filling and corrosion prevention, including gas passages for recycling oil and gas, and a negative pressure valve and a self-sealing valve for preventing oil leakage and wrong attitude filling.
It achieves fast filling speed, long service life, prevents methanol corrosion, and simultaneously recovers oil and gas during filling to avoid environmental pollution.
Smart Images
Figure CN223087597U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a filling gun, in particular to a methanol filling gun. Background Art
[0002] A fuel dispenser nozzle is the terminal output of a fuel dispenser in a gas station, that is, the part in contact with the vehicle fuel tank. Generally, the commonly used ones are self-sealing fuel dispenser nozzles and combined fuel dispenser nozzles.
[0003] Methanol gasoline and ethanol gasoline refer to a new type of environmentally friendly fuel prepared by mixing national standard gasoline and methanol or ethanol and additives in a certain volume (mass) ratio through a strict process. It is a substitute for automotive fuel and an important part of new energy. Methanol gasoline and ethanol gasoline are not only more environmentally friendly, but also have lower costs compared to ordinary gasoline, which is more affordable for consumers. Therefore, methanol gasoline and ethanol gasoline have received widespread attention in recent years.
[0004] However, most of the existing filling guns are still the original gasoline filling guns. When filling methanol gasoline, the filling speed is slow, and because methanol is corrosive and the material of the filling gun is not resistant to methanol corrosion, the service life of the filling gun is short. Summary of the Invention
[0005] The purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a methanol filling gun, which has a simple structure, stable performance, a long service life, and a fast filling speed.
[0006] The technical solution of the utility model: A methanol filling gun includes a gun body, a trigger, and a barrel. An oil inlet and an oil outlet are provided on the gun body. One end of the barrel is an oil outlet end, and the other end is connected to the oil outlet. An anti-corrosion layer is provided on the inner wall of the gun body. A first chamber and a second chamber are provided in the gun body. A main valve is provided in the first chamber, and a non-pressure self-sealing valve and a control valve are provided in the second chamber. The non-pressure self-sealing valve is located above the control valve. A break port is provided between the first chamber and the second chamber. The main valve includes a first main valve spool. The control valve includes a control valve seat and a control spool. The control valve seat is fixedly provided in the second chamber, and the control spool is in linkage cooperation with the first main valve spool. A driving rod connected to the trigger is provided in the second chamber. Under the action of the trigger, the driving rod pushes the control spool and the first main valve spool to move towards the oil inlet direction, and the first chamber and the second chamber are conducted. The main valve further includes a main valve spring. The first main valve spool moves towards the oil outlet direction under the action of the main valve spring, and when the first main valve spool blocks the break port, the first chamber and the second chamber are cut off. Each spool is made of anti-corrosion material.
[0007] With the above technical solution, start the fuel dispenser. The oil liquid enters the gun body through the pipeline from the oil inlet. When the pressure in the first chamber rises to a certain value, the oil pressure acts on the non-pressure self-sealing valve through the oil pressure channel. Under the action of the oil pressure, the non-pressure self-sealing valve enters the working state. At this time, pull the trigger, and the driving rod pushes the control valve core and the main valve core towards the fuel filling port, driving the main valve switch to open, that is, the fuel filling gun enters the working state. Air enters the non-pressure self-sealing valve from the self-sealing port, and the air circulation ensures the normal operation of the non-pressure self-sealing valve. If a vacuum is formed in the pipe after closing the self-sealing port, the self-sealing purpose is achieved. The main valve is opened against the reverse oil pressure to prevent oil leakage caused by pressure increase. The oil channels are linearly arranged, with small frictional resistance along the channels, high fuel filling efficiency, compact structure, and light weight.
[0008] A further setting of the present utility model: The main valve further includes a second main valve core, the second main valve core is located between the first main valve core and the air valve core, and both ends of the main valve spring respectively abut against the second main valve core and the air valve seat.
[0009] With the above further setting, the double main valve cores can play an anti-vibration effect, making the filling gun more stable.
[0010] A further further setting of the present utility model: It further includes a gas channel and an air valve for recovering oil and gas. One end of the gas channel is communicated with the inner and outer layers of the gun barrel, and the other end is communicated with the air valve. The air valve is arranged in the first chamber and close to the oil inlet end. The air valve includes an air valve seat and an air valve core. The air valve seat is fixedly arranged in the first chamber. One end of the air valve core is in linkage cooperation with the first main valve core. When the first main valve core moves towards the oil inlet direction, the gas channel is opened. When the first main valve core moves towards the oil outlet direction, the gas channel is closed.
[0011] With the above further further setting, when refueling an automobile, the oil and gas in the fuel tank will overflow to the air through the fuel filling port of the fuel tank, polluting the environment. Therefore, it is necessary to recover the oil and gas during the refueling process, achieving the effect of synchronously recovering oil and gas during the refueling process.
[0012] A further further further setting of the present utility model: The control valve further includes a push rod and a control valve spring. The push rod is provided with a receiving cavity. The control valve core and the control valve spring are both located in the receiving cavity. The control valve core is provided with a valve core groove, and a corresponding opening is provided on the push rod. One end of the control valve spring abuts against the inner wall of the receiving cavity, and the other end abuts against the control valve core. One end of the push rod passes through the first main valve core and is connected to the second main valve core.
[0013] With the above further further further setting, the installation is convenient, facilitating the control valve core to push the first main valve core and the second main valve core to slide towards the oil inlet direction to conduct the first chamber and the second chamber.
[0014] Further improvement of the present utility model: An oil pressure passage is provided on the first chamber. The pressureless self-sealing valve includes a valve body, a diaphragm chamber is provided on the valve body, the oil pressure passage communicates with the diaphragm chamber, a pressureless diaphragm, a spring seat and a pressureless spring are provided inside the valve body. The pressureless diaphragm is arranged above the spring seat and slides synchronously with the spring seat. A control diaphragm group that slides synchronously with the spring seat is provided on the spring seat. The control diaphragm group includes two rollers, and the rollers can enter the valve core groove under the action of the pressureless diaphragm. A pressureless spring for resetting the spring seat is provided on the spring seat, and the two rollers can disengage from the valve core groove under the action of the pressureless spring.
[0015] With the above further improvement, when starting the fuel dispenser, the oil liquid enters the first chamber from the oil inlet through the pipeline. Under the action of pressure, the pressureless diaphragm will drive the spring seat to move downward, compress the pressureless spring, and push the control diaphragm group to slide synchronously, so that the two rollers on the control diaphragm group move downward into the valve core groove on the control valve core. At this time, the trigger can be activated. When the trigger is activated, it drives the control valve core to move, so that the control shaft is separated from the main valve switch, and the fuel nozzle starts to work. After refueling is completed, the fuel pump of the fuel dispenser stops working, the pressure in the diaphragm chamber decays, and the pressureless spring resets the spring seat, so that the control diaphragm group moves upward synchronously, the two rollers disengage from the valve core groove and separate from the control valve core, and the trigger is locked and cannot be opened, so that the fuel nozzle cannot be opened without pressure.
[0016] Further improvement of the present utility model: The control diaphragm group further includes a bracket, a diaphragm arranged above the bracket, a gasket and a fastener. The two rollers are fixedly arranged on the bracket. The gasket is arranged between the bracket and the diaphragm. The diaphragm and the gasket are connected to the bracket by the fastener and are located on the upper end surface of the bracket.
[0017] With the above further improvement, it is convenient for the installation of the rollers and at the same time enables better synchronous sliding between the rollers and the spring seat.
[0018] Further improvement of the present utility model: A negative pressure valve is provided at the oil outlet position inside the fuel nozzle body. The negative pressure valve includes a negative pressure valve seat, a negative pressure valve core and a negative pressure valve spring. An oil outlet through hole is provided on the negative pressure valve seat, and the negative pressure valve core blocks the oil outlet through hole under the action of the negative pressure valve spring.
[0019] With the above further improvement, when there is no oil pressure or the oil pressure is too low in the second chamber, the negative pressure valve spring presses the negative pressure valve core tightly to close the oil flow. Even if there is a small amount of residual oil, it will not leak. When the first main valve core is opened, the oil pressure in the second chamber increases, the oil pressure overcomes the negative pressure valve spring, and pushes the negative pressure valve core to move, and the oil liquid flows out from the oil outlet through hole. After the first main valve core is closed, the oil pressure also drops until it disappears, and the negative pressure valve spring presses the negative pressure valve core tightly again.
[0020] A further improvement of the present utility model is as follows: An attitude self-sealing valve is further provided inside the gun body. The attitude self-sealing valve includes a self-sealing valve seat and a steel ball. The self-sealing valve seat is fixedly connected to the negative pressure valve seat. A self-sealing chamber for the movement of the steel ball is provided on the self-sealing valve seat, and a tapered opening adapted thereto is provided on the self-sealing chamber.
[0021] With the above further improvement, if the attitude of the gun is incorrect during refueling, the attitude self-sealing valve will close, forcing the fuel gun not to start properly. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 is a schematic diagram of the overall structure of a specific embodiment of the present utility model;
[0023] Figure 2 is a cross-sectional view of a specific embodiment of the present utility model;
[0024] Figure 3 is Figure 2 an enlarged view of part A in
[0025] Figure 4 a cross-sectional view of the control valve, main valve and air valve of a specific embodiment of the present utility model;
[0026] Figure 5 is a cross-sectional view of the gun body.
[0027] In the figures, 1, gun body; 11, oil inlet; 12, oil outlet; 13, first chamber; 131, oil pressure passage; 14, second chamber; 15, on-off port; 2, trigger; 3, barrel; 31, oil outlet end; 32, air intake passage; 4, main valve; 42, first main valve spool; 43, main valve spring; 44, second main valve spool; 5, non-pressure self-sealing valve; 51, valve body; 511, diaphragm chamber; 512, non-pressure diaphragm; 521, roller; 522, bracket; 523, diaphragm; 524, fastener; 6, control valve; 61, control valve seat; 62, control spool; 621, spool groove; 63, ejector rod; 631, accommodation chamber; 632, opening; 64, control valve spring; 7, drive rod; 8, gas passage; 9, air valve; 91, air valve seat; 92, air valve spool; 10, negative pressure valve; 101, negative pressure spool; 102, negative pressure valve spring; 202, steel ball; 204, tapered opening. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0028] Next, the technical solutions in the embodiments will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0029] It should be noted that in the description of the present utility model, all directional indications (such as up, down, front, back...) are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.
[0030] In addition, in the present utility model, the descriptions such as "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. In the description of the present utility model, the meaning of "several" is at least two, such as two, three, etc., unless otherwise specifically defined.
[0031] In addition, the technical solutions between various embodiments of the present utility model can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.
[0032] Such as Figures 1-5As shown, a methanol filling gun comprises a gun body 1, a trigger 2 and a gun barrel 3, wherein the gun body 1 is provided with an oil inlet 11 and an oil outlet 12, the oil inlet 11 can be connected to a hose through an import thread, and then the oil gun can be connected to a fuel dispenser, the oil of the fuel dispenser enters the gun body 1 from the oil inlet 11, and then flows out of the gun body 1 through the oil outlet 12, the inner wall of the gun body 1 is provided with an anti-corrosion layer, the gun body 1 is made of cast aluminum alloy, and its inner wall is made of anodizing process, which can effectively prevent methanol corrosion and make the gun body light and not bulky, one end of the gun barrel 3 is an oil outlet end 31, and the other end is connected to the oil outlet 12, a first chamber 13 and a second chamber 14 are provided in the gun body 1, the first chamber 13 is provided with a main valve 4, the second chamber 14 is provided with a main valve 4, and the second chamber 14 is provided with a main valve 4. A pressure-free self-sealing valve 5 and a control valve 6 are provided in the second chamber 14. The pressure-free self-sealing valve 5 is provided above the control valve 6. A disconnect port 15 is provided between the first chamber 13 and the second chamber 14. The main valve 4 includes a first main valve core 42. The control valve 6 includes a control valve seat 61 and a control valve core 62. The control valve seat 61 is fixed in the second chamber 14. The control valve core 62 cooperates with the first main valve core 42. A driving rod 7 connected to the trigger 2 is provided in the second chamber 14. The driving rod 7 pushes the control valve core 62 and the first main valve core 42 to move toward the oil inlet 11 under the action of the trigger 2. The first chamber 13 and the second chamber 14 are connected. The main valve 4 also includes a main valve spring 43. The first main valve core 42 moves toward the oil outlet 12 under the action of the first main valve core 42, and when the first main valve core 42 is blocked at the on-off port 15, the first chamber 13 and the second chamber 14 are cut off, the fuel dispenser is started, and the oil enters the gun body 1 from the oil inlet 11 through the pipeline. When the pressure in the first chamber 13 rises to a certain value, the oil pressure acts on the pressure-free self-sealing valve 5 through the oil pressure channel. Under the pressure of the oil pressure, the pressure-free self-sealing valve 5 enters the working state. At this time, the trigger 2 is pulled up, and the driving rod 7 pushes the control valve core 62 and the first main valve core 42 toward the fuel filling port, driving the main valve 4 to switch on, that is, the fuel dispenser enters the working state. When refueling is not needed, the main valve spring 43 drives the first main valve core 42 to move toward the oil outlet 12, blocks the on-off port 15, and cuts off the first Chamber 13 and second chamber 14, at the same time, the pressure direction of the main valve spring 43 is the same as the oil pressure direction in the oil pipe, and the oil pressure will also apply a closing pressure to the main valve 4. Therefore, no matter how the oil pressure changes, the main valve 4 can always be closed to prevent oil leakage. A self-sealing port is provided on the barrel 3, and air enters the pressure-free self-sealing valve 5 from the self-sealing port. The air circulation ensures the normal operation of the pressure-free self-sealing valve 5. After the self-sealing port is closed, a vacuum is formed in the pipe to achieve the self-sealing purpose. The main valve 4 is opened by the reverse oil pressure to prevent oil leakage caused by increased pressure. The oil channels are arranged linearly, the resistance along the oil channels is small, the refueling efficiency is high, the structure is compact, and the weight is light. Each valve core, valve seat, etc. are made of 304 stainless steel, and the sealing ring on the valve seat is made of EPDM composite rubber to prevent methanol corrosion.The fuel nozzle may further include a guard bow, which is disposed outside the trigger 2 and detachably connected to the gun body 1 for protecting the hand during fueling. In some embodiments, the guard bow includes one or more pins for clamping the trigger 2, facilitating the operator to fix the trigger 2 during fueling. Correspondingly, the trigger 2 also includes a clamping structure, which is disposed at the tail of the trigger 2 and can be pushed to insert into the respective pins of the guard bow, thereby providing different oil flow rates. The main valve 4 further includes a second main valve spool 44, which is located between the first main valve spool 42 and the air valve spool 92. The two ends of the main valve spring 43 respectively abut against the second main valve spool 44 and the air valve seat 91. The double main valve 4 spools can achieve an anti-vibration effect, making the filling gun more stable.
[0033] It further includes a gas passage 8 and an air valve 9 for recovering oil and gas. One end of the gas passage 8 communicates with the inner and outer layers of the gun barrel 3, and the other end is connected to the air valve 9. The air valve 9 is disposed in the first chamber 13 and near one end of the oil inlet 11. The air valve 9 includes an air valve seat 91 and an air valve spool 92. The air valve seat 91 is fixedly disposed in the first chamber 13. One end of the air valve spool 92 is in linkage cooperation with the first main valve spool 42. When the first main valve spool 42 moves towards the oil inlet 11, the gas passage 8 is opened. When the first main valve spool 42 moves towards the oil outlet 12, the gas passage 8 is closed. When refueling an automobile, the oil and gas in the fuel tank will overflow to the air through the fuel filling port of the fuel tank, polluting the environment. Therefore, it is necessary to recover the oil and gas during the refueling process to achieve the effect of synchronously recovering the oil and gas during the refueling process. The intake end of the above gas passage 8 is located on the gun barrel 3. An annular interlayer is provided on the inner wall of the gun barrel 3 inside the gun barrel 3. A plurality of oil and gas intake ports communicating the outside of the gun barrel 3 with the annular interlayer can be evenly arranged along the circumferential direction of the gun barrel 3 on the outside of the gun barrel 3.
[0034] The control valve 6 further includes a push rod 63 and a control valve spring 64. A receiving cavity 631 is provided inside the push rod 63. The control valve spool 62 and the control valve spring 64 are both located in the receiving cavity 631. A valve spool groove 621 is provided on the control valve spool 62. An opening 632 is correspondingly provided on the push rod 63. One end of the control valve spring 64 abuts against the inner wall of the receiving cavity 631, and the other end abuts against the control valve spool 62. One end of the push rod 63 passes through the first main valve spool 42 and is connected to the second main valve spool 44. The installation is convenient, facilitating the control valve spool 62 to push the first main valve spool 42 and the second main valve spool 44 to slide towards the oil inlet 11 to conduct the first chamber 13 and the second chamber 14.
[0035] An oil pressure channel 131 is provided on the first chamber 13, and the pressureless self-sealing valve 5 includes a valve body 51, and a diaphragm cavity 511 is provided on the valve body 51. The oil pressure channel 131 is communicated with the diaphragm cavity 511, and a pressureless diaphragm 512, a spring seat and a pressureless spring are provided in the valve body 51. The pressureless diaphragm 512 is arranged above the spring seat and slides synchronously with the spring seat. A control diaphragm group that slides synchronously with the spring seat is provided on the spring seat, and the control diaphragm group includes two rollers 521, and the two rollers 521 can enter the valve core groove 621 under the action of the pressureless diaphragm 512. A pressureless spring for resetting the spring seat is provided on the spring seat, and the two rollers 521 can be separated from the valve core groove 621 under the action of the pressureless spring. The fuel dispenser is started, and the oil flows from the fuel dispenser through the pipeline. The oil inlet 11 enters the first chamber 13. Under the action of pressure, the pressure-free diaphragm 512 will drive the spring seat to move downward, compress the pressure-free spring, and push the control diaphragm group to slide synchronously, so that the two rollers 521 on the control diaphragm group move down to the valve core groove 621 on the control valve core 62. At this time, the trigger 2 can be started. The trigger 2 is started, driving the control valve core 62 to move, so that the control shaft is separated from the main valve 4 switch, and the refueling gun starts to work. After refueling is completed, the refueling machine oil pump stops working, and the pressure in the diaphragm 523 cavity 511 decays. The pressure-free spring resets the spring seat, so that the control diaphragm group moves upward synchronously, and the two rollers 521 are separated from the valve core groove 621 and separated from the control valve core 62. The trigger 2 is locked and cannot be opened, so that the refueling gun cannot be opened under no pressure. The control membrane group also includes a bracket 522, a diaphragm 523 arranged above the bracket 522, a gasket and a fastener 524. The two rollers 521 are fixedly arranged on the bracket 522. The gasket is arranged between the bracket 522 and the diaphragm 523. The diaphragm 523 and the gasket are connected to the bracket 522 via the fastener 524 and are located on the upper end surface of the bracket 522, which is convenient for the installation of the roller 521 and enables better synchronous sliding between the roller 521 and the spring seat.
[0036] A negative pressure valve 10 is provided at the oil outlet 12 in the gun body 1, and the negative pressure valve 10 includes a negative pressure valve core 101 and a negative pressure valve spring 102. When there is no oil pressure or the oil pressure is too low in the second chamber 14, the negative pressure valve spring 102 presses the negative pressure valve core 101 to close the oil circulation, and even if there is a small amount of residual oil, it will not leak. When the first main valve core 42 is opened, the oil pressure in the second chamber 14 increases, and the oil pressure overcomes the negative pressure valve spring 102 to push the negative pressure valve core 101 to move, and the oil in the second chamber 14 flows to the gun barrel 3. After the first main valve core 42 is closed, the oil pressure also decreases until it disappears, and the negative pressure valve spring 102 presses the negative pressure valve core 101 again.
[0037] An air intake passage 32 is provided on the barrel 3, and an attitude self-sealing valve is provided at the end of the air intake passage 32. The attitude self-sealing valve includes a self-sealing valve seat and a steel ball 202. The self-sealing valve seat is fixedly connected to the negative pressure valve 10 seat. A self-sealing cavity for the steel ball 202 to move is provided on the self-sealing valve seat. A tapered opening 204 adapted thereto is provided on the self-sealing cavity. If the posture of the gun is incorrect during refueling, the attitude self-sealing valve will close, forcing the fuel gun not to start normally.
Claims
1. A methanol filling gun, comprising a gun body (1), a trigger (2) and a barrel (3). An oil inlet (11) and an oil outlet (12) are provided on the gun body (1). One end of the barrel (3) is an oil outlet end (31), and the other end is connected to the oil outlet (12). It is characterized in that, An anti-corrosion layer is provided on the inner wall of the gun body. The gun body (1) is provided with a first chamber (13) and a second chamber (14). A main valve (4) is provided in the first chamber (13), and a non-pressure self-sealing valve (5) and a control valve (6) are provided in the second chamber (14). The non-pressure self-sealing valve (5) is arranged above the control valve (6). A switching port (15) is provided between the first chamber (13) and the second chamber (14). The main valve (4) includes a first main valve spool (42). The control valve (6) includes a control valve seat (61) and a control spool (62). The control valve seat (61) is fixedly arranged in the second chamber (14). The control spool (62) is in linkage cooperation with the first main valve spool (42). A driving rod (7) connected to the trigger (2) is provided in the second chamber (14). Under the action of the trigger (2), the driving rod (7) pushes the control spool (62) and the first main valve spool (42) to move towards the oil inlet (11), and the first chamber (13) and the second chamber (14) are communicated. The main valve (4) further includes a main valve spring (43). The first main valve spool (42) moves towards the oil outlet (12) under the action of the main valve spring (43). When the first main valve spool (42) blocks the switching port (15), the first chamber (13) and the second chamber (14) are cut off. Each spool is made of anti-corrosion material.
2. The methanol filling gun according to claim 1, characterized in that, It further includes a gas channel (8) and a gas valve (9) for recovering oil and gas. One end of the gas channel (8) is communicated with the inner and outer layers of the barrel (3), and the other end is communicated with the gas valve (9). The gas valve (9) is arranged in the first chamber (13) and close to one end of the oil inlet (11). The gas valve (9) includes a gas valve seat (91) and a gas valve spool (92). The gas valve seat (91) is fixedly arranged in the first chamber (13). One end of the gas valve spool (92) is in linkage cooperation with the first main valve spool (42). When the first main valve spool (42) moves towards the oil inlet (11), the gas channel (8) is opened. When the first main valve spool (42) moves towards the oil outlet (12), the gas channel (8) is closed.
3. The methanol filling gun according to claim 2, characterized in that, The main valve (4) further includes a second main valve spool (44). The second main valve spool (44) is located between the first main valve spool (42) and the gas valve spool (92). Both ends of the main valve spring (43) respectively abut against the second main valve spool (44) and the gas valve seat (91).
4. The methanol filling gun according to claim 3, characterized in that, The control valve (6) further includes a push rod (63) and a control valve spring (64). An accommodation cavity (631) is provided in the push rod (63). The control spool (62) and the control valve spring (64) are both located in the accommodation cavity (631). A spool groove (621) is provided on the control spool (62). An opening (632) is correspondingly provided on the push rod (63). One end of the control valve spring (64) abuts against the inner wall of the accommodation cavity (631), and the other end abuts against the control spool (62). One end of the push rod (63) passes through the first main valve spool (42) and is connected to the second main valve spool (44).
5. The methanol filling gun according to claim 1 or 2 or 3 or 4, characterized in that, The first chamber (13) is provided with an oil pressure channel. The pressure-free self-sealing valve (5) comprises a valve body (51). The valve body (51) is provided with a diaphragm cavity (511). The oil pressure channel is communicated with the diaphragm cavity (511). A pressure-free diaphragm (512), a spring seat and a pressure-free spring are provided in the valve body (51). The pressure-free diaphragm (512) is arranged above the spring seat and slides synchronously with the spring seat. The spring seat is provided with a control diaphragm group that slides synchronously with the spring seat. The control diaphragm group comprises two rollers (521). The two rollers (521) can enter the valve core groove (621) under the action of the pressure-free diaphragm (512). The spring seat is provided with a pressure-free spring for resetting the spring seat. The two rollers (521) can be separated from the valve core groove (621) under the action of the pressure-free spring.
6. The methanol filling gun according to claim 5, characterized in that, The control membrane group further comprises a bracket (522), a membrane (523) arranged above the bracket (522), a gasket and a fastener (524); the two rollers (521) are fixedly arranged on the bracket (522); the gasket is arranged between the bracket (522) and the membrane (523); the membrane (523) and the gasket are connected to the bracket (522) via the fastener (524) and are located on the upper end surface of the bracket (522).
7. The methanol filling gun according to claim 1 or 2, characterized in that A negative pressure valve (10) is provided in the gun body (1) at the oil outlet (12). The negative pressure valve (10) comprises a negative pressure valve core (101) and a negative pressure valve spring (102). The negative pressure valve core (101) blocks the oil outlet through hole under the action of the negative pressure valve spring (102).
8. The methanol filling gun according to claim 7, wherein The gun barrel (3) has an air inlet passage (32) in which a posture self-sealing valve is provided. The posture self-sealing valve comprises a self-sealing valve seat and a steel ball (202). The self-sealing valve seat is fixedly connected to the seat of the negative pressure valve (10). The self-sealing valve seat is provided with a self-sealing chamber for the steel ball (202) to move. The self-sealing chamber is provided with a matching conical opening (204).